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1591-1593 9Th Ave

Inner Sunset, SF 94122 1855018 2 units · 2 fl · 1939

This building has significantly more problems than most nearby buildings. Few open issues; problems get fixed quickly. A reasonable bet for a smooth tenancy.

NOVs (7y) vs. neighborhood
Compared to a typical building in Inner Sunset
Above average
avg 1.1
6
FewerMore

This building has 6 novs (7y), above the Inner Sunset average of 1.1.

Rent & eviction protection

Is 1591-1593 9Th Ave rent-controlled?

San Francisco's Rent Ordinance caps rent increases and provides eviction protection for most residential units built before 1979 with 2+ units. Here's how this building scores.

Built before 1979
Built 1939
2 or more units
2 units
Property type
Multi-Family Residential
Zoning
RH2
Likely rent-controlled. Building age and unit count suggest this property falls under San Francisco's Rent Ordinance.

Based on SF Assessor records. Not legal advice — confirm with the SF Rent Board.

Building characteristics
Units2
Floors2
Year built1939
Total area2,750 sq ft
Property typeMulti-Family Residential
Tax statusNone
Blocklot1855018
Ownership

Registered owner per SF Assessor-Recorder (secured roll).

Owner name
Sng Albert F (Ot)
Mailing address
1591 9th Ave San Francisco CA 94122
Last sale
071317

Landlord portfolio

Other SF properties this owner holds, with risk grades for each.

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Multiple entrances & addresses

Included addresses

All street addresses sharing this blocklot that are covered by this report.

1593 09th Ave, San Francisco, CA 94122
1591 09th Ave, San Francisco, CA 94122
Augrented Insights
Initial analysis

The property at 1591-1593 9th Avenue in San Francisco's Inner Sunset neighborhood is a two-unit multi-family residential building constructed in 1939, featuring two stories and classified as a Flats & Duplex building. The most pressing current issues involve active building violations from February 2023, alleging unauthorized modifications including an unpermitted second dwelling unit on the ground level, unapproved wiring, plumbing work, and inadequate fire safety measures. These violations also cite concerns about improper occupancy and safety code non-compliance. A tenant complaint from February 2023 reported multiple serious concerns, including lack of central heating since October 2022, electrical issues affecting appliance functionality, and a rodent infestation, suggesting maintenance and habitability problems. Additional violations from March 2023 addressed fire safety (missing fire extinguisher) and sanitation issues.

The building's improvement history shows some significant renovations, particularly in 2015 when Unit 1 on the second floor underwent bathroom remodels and closet modifications, with corresponding electrical and plumbing work totaling $28,000. Earlier modifications from 1999 involved substantial basement improvements including multiple bathrooms, laundry areas, a game room, and garage door modifications. The property has experienced recurring issues with unauthorized modifications, as evidenced by an active complaint from 2018 regarding unpermitted remodeling work. A previous illegal short-term rental operation at the property was shut down due to building complaints, and there have been various maintenance issues reported through 311 calls, primarily related to graffiti and street cleaning matters in the surrounding area. The combination of active building violations, maintenance complaints, and unauthorized modifications suggests ongoing regulatory and habitability challenges at this property.

AI-generated · may contain errors · check the source data tables below

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Risk rating

How 1591-1593 9Th Ave's risk score is calculated

We trained a model on 7 years of SF DBI inspection data — notice of violation filings, complaint history, and owner track records. It estimates the probability that DBI inspectors will issue a Notice of Violation at this address in the next 12 months. Lower % = safer.

What the score means for you

Grade A–B — Low risk

DBI rarely finds violations here. Strong maintenance history and a clean complaint record.

Grade C — Moderate risk

Some past violations or complaints on record. Worth asking the landlord about any open issues before signing.

Grade D–F — High risk

Elevated violation and complaint history. DBI has found issues here before and is statistically likely to again.

Neighborhood percentile
12th percentile

Out of 1493 buildings in this neighborhood, 1314 are predicted to be safer.

RiskiestSafest
Predicted 12-month outcome
54%
No DBI
violation
46%
DBI violation
likely
Model explanation

What's driving this score

The three data points that most influenced this building's risk rating — ranked by the weight the model placed on each one.

NOV rate, owner's portfolio

Per-building NOV rate across everything this owner manages — high rates signal pattern neglect.

DBI tenant complaints (past 7 years)

Formal complaints tenants filed with DBI about this building over 7 years.

Neighborhood location

Precise location is a proxy for neighborhood-level risk — some SF blocks have systematically higher DBI activity.

12-Month severity forecast
No violation 54.7%
Moderate concern 27.5%
Severe concern 17.9%
Estimated probability of receiving a DBI Notice of Violation in the next 12 months at each severity level. Model: full_hgb_balanced.
Apartment reviews

1591-1593 9Th Ave apartment reviews

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The story over time

1591-1593 9Th Ave event timeline

Violations, complaints, fire incidents, permits, and buyouts — most recent records in order.

2025
311 Request Oct 27
Garbage and debris
human waste or urine
311 RequestSep 21
Garbage and debris

See all 12 events

Full history back to 2023 — violations, complaints, permits, buyouts, and fire incidents.

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Every record we have

Full data for 1591-1593 9Th Ave apartments

13 SF public datasets for this parcel — permits, violations, complaints, fire records, 311 calls, planning records, and buyouts.

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Cancel anytime · Data sourced from SF Open Data, DBI, SFFD, SF Rent Board & Planning

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